Parse apr.h with a C preprocessor
mod_perl's build script parses /usr/include/apr-1/apr.h for detecting
APR_HAS_THREADS preprocessor symbol to decide whether APR library
supports threads. Then APR::ThreadMutex module is built only if APR
library was built with threads support.
But /usr/include/apr-1/apr.h on some architectures (e.g. not on aarch64)
is a wrapper for the real platform-specific header file. As a result
mod_perl was erroneously built without APR::ThreadMutex module.
This patch replaces opening that header file with executing
a C preprocessor for the header file. That restores compatibility
with the multilib-sanitized /usr/include/apr-1/apr.h header file (e.g.
on x86_64).
This patch uses safe more-than-3-list form of piped open(). This is
not supported on Windows Perl < 5.022.
https://bugzilla.redhat.com/show_bug.cgi?id=1981927
Signed-off-by: Petr Písař <ppisar@redhat.com>
[Modified from the original patch on
https://rt.cpan.org/Public/Bug/Display.html?id=137599
by the committer to retain the old style for WIN32 since
we need to support perls older than 5.022.]
git-svn-id: https://svn.apache.org/repos/asf/perl/modperl/trunk@1894282 13f79535-47bb-0310-9956-ffa450edef68
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